package com.baomidou.springmvc.common.utils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.io.File;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.io.IOException;
import java.awt.image.BufferedImage;


public final class QrcodeUtil {

	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private QrcodeUtil() {}


	public static BufferedImage toBufferedImage(BitMatrix matrix) {
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
			}
		}
		return image;
	}


	public static void writeToFile(BitMatrix matrix, String format, File file)
			throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, file)) {
			throw new IOException("Could not write an image of format " + format + " to " + file);
		}
	}


	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
			throws IOException {
		BufferedImage image = toBufferedImage(matrix);
		if (!ImageIO.write(image, format, stream)) {
			throw new IOException("Could not write an image of format " + format);
		}
	}

	
	/**
	 * 生成二维码入库方法
	 * @description 
	 * @author hewei
	 * @title: genQrcode
	 * @date 2017年7月17日 下午4:06:34
	 * @param content 内容
	 * @param path 路径
	 * @param fileName 文件名不包含扩展名
	 * @param extName 后缀名
	 */
	public static void genQrcode(String content,String path,String fileName,String extName){
		try {
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			fileName = fileName + "." + extName;
			Map hints = new HashMap();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 300, 300,hints);
			File file1 = new File(path,fileName);
			QrcodeUtil.writeToFile(bitMatrix, extName, file1);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static void main(String[] args) {
		genQrcode("http://39.108.73.154:8080/myBlog","C:\\Users\\hewei\\Desktop","test","png");
	}
}